Initial commit

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>
2020-01-15 20:15:14 -05:00
commit a61ad46b49
45 changed files with 1720 additions and 0 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -0,0 +1,207 @@
 # Created by https://www.gitignore.io/api/vim,python,django,virtualenv
 # Edit at https://www.gitignore.io/?templates=vim,python,django,virtualenv
 ### Django ###
 *.log
 *.pot
 *.pyc
 __pycache__/
 local_settings.py
 db.sqlite3
 db.sqlite3-journal
 media
 # If your build process includes running collectstatic, then you probably don't need or want to include staticfiles/
 # in your Git repository. Update and uncomment the following line accordingly.
 # <django-project-name>/staticfiles/
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 # Byte-compiled / optimized / DLL files
 *.py[cod]
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 # Distribution / packaging
 .Python
 build/
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 lib/
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 *.egg-info/
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 *.egg
 MANIFEST
 # PyInstaller
 #  Usually these files are written by a python script from a template
 #  before PyInstaller builds the exe, so as to inject date/other infos into it.
 *.manifest
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 # Installer logs
 pip-log.txt
 pip-delete-this-directory.txt
 # Unit test / coverage reports
 htmlcov/
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 .coverage
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 .cache
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 # Translations
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 # Scrapy stuff:
 .scrapy
 # Sphinx documentation
 docs/_build/
 # PyBuilder
 target/
 # pyenv
 .python-version
 # pipenv
 #   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
 #   However, in case of collaboration, if having platform-specific dependencies or dependencies
 #   having no cross-platform support, pipenv may install dependencies that don't work, or not
 #   install all needed dependencies.
 #Pipfile.lock
 # celery beat schedule file
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 *.sage.py
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 # Mr Developer
 .mr.developer.cfg
 .project
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 # mkdocs documentation
 /site
 # mypy
 .mypy_cache/
 .dmypy.json
 dmypy.json
 # Pyre type checker
 .pyre/
 ### Python ###
 # Byte-compiled / optimized / DLL files
 # C extensions
 # Distribution / packaging
 # PyInstaller
 #  Usually these files are written by a python script from a template
 #  before PyInstaller builds the exe, so as to inject date/other infos into it.
 # Installer logs
 # Unit test / coverage reports
 # Translations
 # Scrapy stuff:
 # Sphinx documentation
 # PyBuilder
 # pyenv
 # pipenv
 #   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
 #   However, in case of collaboration, if having platform-specific dependencies or dependencies
 #   having no cross-platform support, pipenv may install dependencies that don't work, or not
 #   install all needed dependencies.
 # celery beat schedule file
 # SageMath parsed files
 # Spyder project settings
 # Rope project settings
 # Mr Developer
 # mkdocs documentation
 # mypy
 # Pyre type checker
 ### Vim ###
 # Swap
 [._]*.s[a-v][a-z]
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 # Session
 Session.vim
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 # Temporary
 .netrwhist
 *~
 # Auto-generated tag files
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 # Persistent undo
 [._]*.un~
 # Coc configuration directory
 .vim
 ### VirtualEnv ###
 # Virtualenv
 # http://iamzed.com/2009/05/07/a-primer-on-virtualenv/
 pyvenv.cfg
 .env
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 ENV/
 env.bak/
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 pip-selfcheck.json
 # End of https://www.gitignore.io/api/vim,python,django,virtualenv
--- a/20
+++ b/20
@@ -0,0 +1,20 @@
 [[source]]
 name = "pypi"
 url = "https://pypi.org/simple"
 verify_ssl = true
 [dev-packages]
 black = "==19.10b0"
 [packages]
 django = "==2.2"
 django-bootstrap4 = "*"
 django-invitations = "*"
 django-hashid-field = "*"
 frozendict = "*"
 [requires]
 python_version = "3.8"
 [pipenv]
 allow_prereleases = true
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -0,0 +1,189 @@
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 }
--- a/local-manage.sh
+++ b/local-manage.sh
@@ -0,0 +1,2 @@
 #!/bin/bash
 exec python3 ./manage.py "$@" --settings=market.settings.local
--- a/manage.py
+++ b/manage.py
@@ -0,0 +1,21 @@
 #!/usr/bin/env python
 """Django's command-line utility for administrative tasks."""
 import os
 import sys
 def main():
    os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'market.settings')
    try:
        from django.core.management import execute_from_command_line
    except ImportError as exc:
        raise ImportError(
            "Couldn't import Django. Are you sure it's installed and "
            "available on your PYTHONPATH environment variable? Did you "
            "forget to activate a virtual environment?"
        ) from exc
    execute_from_command_line(sys.argv)
 if __name__ == '__main__':
    main()
--- a/market/init.py
+++ b/market/init.py
--- a/market/asgi.py
+++ b/market/asgi.py
@@ -0,0 +1,16 @@
 """
 ASGI config for market project.
 It exposes the ASGI callable as a module-level variable named ``application``.
 For more information on this file, see
 https://docs.djangoproject.com/en/3.0/howto/deployment/asgi/
 """
 import os
 from django.core.asgi import get_asgi_application
 os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'market.settings')
 application = get_asgi_application()
--- a/market/settings/init.py
+++ b/market/settings/init.py
--- a/market/settings/common.py
+++ b/market/settings/common.py
@@ -0,0 +1,137 @@
 """
 Django settings for market project.
 Generated by 'django-admin startproject' using Django 3.0.2.
 For more information on this file, see
 https://docs.djangoproject.com/en/3.0/topics/settings/
 For the full list of settings and their values, see
 https://docs.djangoproject.com/en/3.0/ref/settings/
 """
 import os
 from pathlib import Path
 from django.urls import reverse_lazy
 # Build paths inside the project like this: os.path.join(BASE_DIR, ...)
 BASE_DIR = str(
    Path(__file__)  # ./market/settings/common.py
        .resolve()  # PWD/market/settings/common.py
        .parent     # PWD/market/settings
        .parent     # PWD/market/
        .parent     # PWD/      (goal)
 )
 # Quick-start development settings - unsuitable for production
 # See https://docs.djangoproject.com/en/3.0/howto/deployment/checklist/
 # SECURITY WARNING: keep the secret key used in production secret!
 # SECRET_KEY = 
 # SECURITY WARNING: don't run with debug turned on in production!
 DEBUG = False
 ALLOWED_HOSTS = []
 # Application definition
 INSTALLED_APPS = [
    "django.contrib.admin",
    "django.contrib.auth",
    "django.contrib.contenttypes",
    "django.contrib.sessions",
    "django.contrib.messages",
    "django.contrib.staticfiles",
    "django.contrib.humanize",
    # Our apps
    "trading",
    # Third party apps
    "bootstrap4",
 ]
 AUTHENTICATION_BACKENDS = [
    "django.contrib.auth.backends.ModelBackend",
 ]
 MIDDLEWARE = [
    "django.middleware.security.SecurityMiddleware",
    "django.contrib.sessions.middleware.SessionMiddleware",
    "django.middleware.common.CommonMiddleware",
    "django.middleware.csrf.CsrfViewMiddleware",
    "django.contrib.auth.middleware.AuthenticationMiddleware",
    "django.contrib.messages.middleware.MessageMiddleware",
    "django.middleware.clickjacking.XFrameOptionsMiddleware",
 ]
 ROOT_URLCONF = "market.urls"
 TEMPLATES = [
    {
        "BACKEND": "django.template.backends.django.DjangoTemplates",
        "DIRS": [],
        "APP_DIRS": True,
        "OPTIONS": {
            "context_processors": [
                "django.template.context_processors.debug",
                "django.template.context_processors.request",
                "django.contrib.auth.context_processors.auth",
                "django.contrib.messages.context_processors.messages",
            ],
        },
    },
 ]
 WSGI_APPLICATION = "market.wsgi.application"
 DATABASES = {
    "default": {
        "ENGINE": "django.db.backends.sqlite3",
        "NAME": os.path.join(BASE_DIR, "db.sqlite3"),
    }
 }
 AUTH_PASSWORD_VALIDATORS = [
    {
        "NAME": "django.contrib.auth.password_validation.UserAttributeSimilarityValidator",
    },
    {"NAME": "django.contrib.auth.password_validation.MinimumLengthValidator",},
    {"NAME": "django.contrib.auth.password_validation.CommonPasswordValidator",},
    {"NAME": "django.contrib.auth.password_validation.NumericPasswordValidator",},
 ]
 AUTH_USER_MODEL = "trading.User"
 LOGIN_URL = reverse_lazy("trading:login")
 LOGIN_REDIRECT_URL = reverse_lazy("trading:index")
 # Internationalization
 # https://docs.djangoproject.com/en/3.0/topics/i18n/
 LANGUAGE_CODE = "en-us"
 TIME_ZONE = "UTC"
 USE_I18N = True
 USE_L10N = True
 USE_TZ = True
 STATIC_URL = "/static/"
 # Guardian object permissions can be found at
 # https://django-guardian.readthedocs.io/en/stable/configuration.html
 #GUARDIAN_RENDER_403 = True
 #GUARDIAN_TEMPLATE_403 = "403.html"
 # Disable anonymous user permissions
 #ANONYMOUS_USER_NAME = None
 # TODO: look at this if it makes sense to fetch all user permissions upon application startup
 # (Probably not necessary)
 # GUARDIAN_AUTO_PREFETCH = True
 # This app's settings
 from market.settings.defaults import *
--- a/market/settings/defaults.py
+++ b/market/settings/defaults.py
@@ -0,0 +1,18 @@
 # Whether an invitation is required to join.
 TRADING_INVITE_REQUIRED = True
 # Number of invites that a user gets when they sign up.
 TRADING_FREE_INVITES = 3
 # Number of accounts that a new user is allowed to create.
 # Use `None` for unlimited.
 TRADING_FREE_ACCOUNTS = 5
 # Number of commodities that a user gets when they sign up.
 TRADING_FREE_COMMODITIES = 1
 # Maximum number of commodities allowed for a single IPO
 TRADING_IPO_MAX = 5000000
 # Minimum number of commodities allowed for a single IPO
 TRADING_IPO_MIN = 100
--- a/market/settings/local.py
+++ b/market/settings/local.py
@@ -0,0 +1,18 @@
 import os.path
 from market.settings.common import *
 SECRET_KEY = "65sb@2f)s03(%qcb)cs6-wexn1af&3&$o12pp7%4en_*p6(b-d"
 DEBUG = True
 ALLOWED_HOSTS = []
 TIME_ZONE = "US/Eastern"
 STATICFILES_DIRS = [
    os.path.join(BASE_DIR, "static"),
 ]
 EMAIL_BACKEND = "django.core.mail.backends.console.EmailBackend"
 # pwgen -r '"'"'" -cyn 128
 HASHID_FIELD_SALT = "h)1qE%eGhOZha_<`*2#$<m^,/K.w;I#s/Er,cpbad-?"
 TRADING_FREE_ACCOUNTS = None
--- a/market/urls.py
+++ b/market/urls.py
@@ -0,0 +1,28 @@
 """market URL Configuration
 The `urlpatterns` list routes URLs to views. For more information please see:
    https://docs.djangoproject.com/en/3.0/topics/http/urls/
 Examples:
 Function views
    1. Add an import:  from my_app import views
    2. Add a URL to urlpatterns:  path('', views.home, name='home')
 Class-based views
    1. Add an import:  from other_app.views import Home
    2. Add a URL to urlpatterns:  path('', Home.as_view(), name='home')
 Including another URLconf
    1. Import the include() function: from django.urls import include, path
    2. Add a URL to urlpatterns:  path('blog/', include('blog.urls'))
 """
 from django.conf import settings
 from django.conf.urls.static import static
 from django.contrib import admin
 from django.urls import path, include
 urlpatterns = [
    path("admin/", admin.site.urls),
    path("", include("trading.urls")),
 ]
 # Serve up static files using Django server if in DEBUG mode
 if settings.DEBUG:
    urlpatterns += static(settings.STATIC_URL, document_root=settings.STATIC_ROOT)
--- a/market/wsgi.py
+++ b/market/wsgi.py
@@ -0,0 +1,16 @@
 """
 WSGI config for market project.
 It exposes the WSGI callable as a module-level variable named ``application``.
 For more information on this file, see
 https://docs.djangoproject.com/en/3.0/howto/deployment/wsgi/
 """
 import os
 from django.core.wsgi import get_wsgi_application
 os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'market.settings')
 application = get_wsgi_application()
--- a/static/trading/css/bootstrap.min.css
+++ b/static/trading/css/bootstrap.min.css
--- a/static/trading/js/bootstrap.min.js
+++ b/static/trading/js/bootstrap.min.js
--- a/static/trading/js/jquery-3.3.1.slim.min.js
+++ b/static/trading/js/jquery-3.3.1.slim.min.js
--- a/static/trading/js/popper.min.js
+++ b/static/trading/js/popper.min.js
--- a/tests/init.py
+++ b/tests/init.py
--- a/tests/test_models.py
+++ b/tests/test_models.py
@@ -0,0 +1,26 @@
 from django.test import TestCase
 from trading.models import User, Commodity, Tx, BalanceError
 class TestTransactions(TestCase):
    def test_user_balances(self):
        # Create users
        user1 = User.objects.create_user(username="test1", email="test1@test.test")
        user2 = User.objects.create_user(username="test2", email="test2@test.test")
        commodity = Commodity(created_by=user1, in_circulation=1000, name="commodity")
        commodity.save()
        self.assertEqual(user1.balances(), {commodity: 1000})
        self.assertEqual(user2.balances(), {})
        Tx(source=user1, dest=user2, amount=100, commodity=commodity).save()
        self.assertEqual(user1.balances(), {commodity: 900})
        self.assertEqual(user2.balances(), {commodity: 100})
        with self.assertRaises(BalanceError):
            Tx(source=user2, dest=user1, amount=1000, commodity=commodity).save()
        self.assertEqual(user1.balances(), {commodity: 900})
        self.assertEqual(user2.balances(), {commodity: 100})
--- a/trading/init.py
+++ b/trading/init.py
--- a/trading/admin.py
+++ b/trading/admin.py
@@ -0,0 +1,3 @@
 from django.contrib import admin
 # Register your models here.
--- a/trading/apps.py
+++ b/trading/apps.py
@@ -0,0 +1,5 @@
 from django.apps import AppConfig
 class TradingConfig(AppConfig):
    name = 'trading'
--- a/trading/forms.py
+++ b/trading/forms.py
--- a/trading/managers.py
+++ b/trading/managers.py
@@ -0,0 +1,31 @@
 from django.contrib.auth.base_user import BaseUserManager
 class UserManager(BaseUserManager):
    use_in_migrations = True
    def _create_user(self, username, email, password, **extra_fields):
        """
        Creates and saves a User with the given email and password.
        """
        if not email:
            raise ValueError('The given email must be set')
        if not username:
            raise ValueError('The given username must be set')
        # TODO: validate username
        email = self.normalize_email(email)
        user = self.model(username=username, email=email, **extra_fields)
        user.set_password(password)
        user.save(using=self._db)
        return user
    def create_user(self, username, email, password=None, **extra_fields):
        extra_fields.setdefault('is_superuser', False)
        return self._create_user(username, email, password, **extra_fields)
    def create_superuser(self, username, email, password, **extra_fields):
        extra_fields.setdefault('is_superuser', True)
        if extra_fields.get('is_superuser') is not True:
            raise ValueError('Superuser must have is_superuser=True.')
        return self._create_user(username, email, password, **extra_fields)
--- a/trading/migrations/0001_initial.py
+++ b/trading/migrations/0001_initial.py
@@ -0,0 +1,97 @@
 # Generated by Django 2.2 on 2020-01-16 01:11
 from django.conf import settings
 from django.db import migrations, models
 import django.db.models.deletion
 import hashid_field.field
 import trading.managers
 class Migration(migrations.Migration):
    initial = True
    dependencies = [
        ('auth', '0011_update_proxy_permissions'),
    ]
    operations = [
        migrations.CreateModel(
            name='User',
            fields=[
                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
                ('password', models.CharField(max_length=128, verbose_name='password')),
                ('last_login', models.DateTimeField(blank=True, null=True, verbose_name='last login')),
                ('username', models.CharField(max_length=30, unique=True)),
                ('email', models.EmailField(max_length=254, unique=True)),
                ('is_superuser', models.BooleanField(default=False)),
                ('is_active', models.BooleanField(default=True)),
                ('date_joined', models.DateTimeField(auto_now_add=True, verbose_name='date joined')),
                ('max_commodities_allowed', models.PositiveIntegerField(default=1, null=True, verbose_name='number of commodities this user is allowed to create')),
                ('groups', models.ManyToManyField(blank=True, help_text='The groups this user belongs to. A user will get all permissions granted to each of their groups.', related_name='user_set', related_query_name='user', to='auth.Group', verbose_name='groups')),
                ('user_permissions', models.ManyToManyField(blank=True, help_text='Specific permissions for this user.', related_name='user_set', related_query_name='user', to='auth.Permission', verbose_name='user permissions')),
            ],
            options={
                'verbose_name': 'user',
                'verbose_name_plural': 'users',
            },
            managers=[
                ('objects', trading.managers.UserManager()),
            ],
        ),
        migrations.CreateModel(
            name='Commodity',
            fields=[
                ('id', hashid_field.field.HashidAutoField(alphabet='abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890', min_length=7, primary_key=True, serialize=False)),
                ('name', models.CharField(max_length=100, unique=True, verbose_name='commodity name')),
                ('in_circulation', models.PositiveIntegerField()),
                ('symbol', models.CharField(blank=True, max_length=6, unique=True, verbose_name='symbol')),
                ('created_by', models.ForeignKey(null=True, on_delete=django.db.models.deletion.SET_NULL, to=settings.AUTH_USER_MODEL)),
            ],
            options={
                'verbose_name': 'commodity',
                'verbose_name_plural': 'commodities',
            },
        ),
        migrations.CreateModel(
            name='TxRequests',
            fields=[
                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
                ('status', models.CharField(choices=[('WAIT', 'Waiting'), ('DECL', 'Declined'), ('REV', 'Revised')], default='WAIT', max_length=2)),
                ('source_amount', models.PositiveIntegerField()),
                ('dest_amount', models.PositiveIntegerField()),
                ('dest', models.ForeignKey(null=True, on_delete=django.db.models.deletion.CASCADE, related_name='transaction_requests_received', to=settings.AUTH_USER_MODEL)),
                ('dest_sends', models.ForeignKey(null=True, on_delete=django.db.models.deletion.CASCADE, related_name='+', to='trading.Commodity')),
                ('previous_request', models.OneToOneField(default=None, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='revised_request', to='trading.TxRequests')),
                ('source', models.ForeignKey(null=True, on_delete=django.db.models.deletion.CASCADE, related_name='transaction_requests_sent', to=settings.AUTH_USER_MODEL)),
                ('source_sends', models.ForeignKey(null=True, on_delete=django.db.models.deletion.CASCADE, related_name='+', to='trading.Commodity')),
            ],
        ),
        migrations.CreateModel(
            name='Tx',
            fields=[
                ('id', hashid_field.field.HashidAutoField(alphabet='abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890', min_length=7, primary_key=True, serialize=False)),
                ('instant', models.DateTimeField(auto_now_add=True)),
                ('amount', models.PositiveIntegerField(editable=False, verbose_name='amount')),
                ('commodity', models.ForeignKey(editable=False, on_delete=django.db.models.deletion.PROTECT, to='trading.Commodity')),
                ('dest', models.ForeignKey(editable=False, on_delete=django.db.models.deletion.PROTECT, related_name='credits', related_query_name='credit_tx', to=settings.AUTH_USER_MODEL, verbose_name='destination')),
                ('source', models.ForeignKey(editable=False, on_delete=django.db.models.deletion.PROTECT, related_name='debits', related_query_name='debit_tx', to=settings.AUTH_USER_MODEL, verbose_name='source')),
            ],
            options={
                'verbose_name': 'transaction',
                'verbose_name_plural': 'transactions',
            },
        ),
        migrations.CreateModel(
            name='Invite',
            fields=[
                ('id', hashid_field.field.HashidAutoField(alphabet='abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890', min_length=7, primary_key=True, serialize=False)),
                ('accepted_user', models.ForeignKey(default=None, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='+', to=settings.AUTH_USER_MODEL, verbose_name='accepted user')),
                ('inviter', models.ForeignKey(null=True, on_delete=django.db.models.deletion.SET_NULL, to=settings.AUTH_USER_MODEL)),
            ],
            options={
                'verbose_name': 'invite',
                'verbose_name_plural': 'invites',
            },
        ),
    ]
--- a/trading/migrations/init.py
+++ b/trading/migrations/init.py
--- a/trading/models.py
+++ b/trading/models.py
@@ -0,0 +1,279 @@
 from datetime import date
 from typing import Mapping, Optional, Sequence
 from django.conf import settings
 from django.contrib.auth.models import AbstractBaseUser, PermissionsMixin
 from django.db import models
 from django.db.models.signals import post_save, pre_save
 from django.dispatch import receiver
 from django.utils.translation import gettext_lazy as _
 from frozendict import frozendict
 from hashid_field import HashidAutoField
 from trading.managers import UserManager
 class User(PermissionsMixin, AbstractBaseUser):
    """
    Base user model, with auth information already filled in.
    """
    username = models.CharField(max_length=30, unique=True)
    email = models.EmailField(unique=True)
    is_superuser = models.BooleanField(default=False)
    is_active = models.BooleanField(default=True)
    date_joined = models.DateTimeField(_("date joined"), auto_now_add=True)
    max_commodities_allowed = models.PositiveIntegerField(
        default=settings.TRADING_FREE_COMMODITIES,
        null=True,
        verbose_name=_("number of commodities this user is allowed to create"),
    )
    objects = UserManager()
    USERNAME_FIELD = "username"
    EMAIL_FIELD = "email"
    REQUIRED_FIELDS = (EMAIL_FIELD,)
    class Meta:
        verbose_name = _("user")
        verbose_name_plural = _("users")
    def get_full_name(self):
        """
        Returns the first_name plus the last_name, with a space in between.
        """
        return self.username
    def get_short_name(self):
        """
        Returns the short name for the user.
        """
        return self.username
    def email_user(self, subject, message, from_email=None, **kwargs):
        """
        Sends an email to this User.
        """
        send_mail(subject, message, from_email, [self.email], **kwargs)
    def can_create_commodity(self) -> bool:
        if self.max_commodities_allowed is None:
            return True
        return self.max_commodities_allowed > self.commodity_set.count()
    def unused_commodities(self) -> Optional[int]:
        if self.max_commodities_allowed is None:
            return None
        return self.max_commodities_allowed - self.commodity_set.count()
    def unused_invites(self) -> Sequence["Invite"]:
        return self.invite_set.filter(accepted_user__isnull=True)
    def balance_of(self, commodity: "Commodity") -> int:
        return self.balances().get(commodity, 0)
    def balances(self) -> Mapping["Commodity", int]:
        from django.db.models import Sum
        credits = {
            row["commodity"]: row["amount__sum"]
            for row in self.credits.values("commodity").annotate(Sum("amount"))
        }
        debits = {
            row["commodity"]: row["amount__sum"]
            for row in self.debits.values("commodity").annotate(Sum("amount"))
        }
        ipos = {
            row["pk"]: row["in_circulation"]
            for row in self.commodity_set.values("pk", "in_circulation")
        }
        keys = set(ipos.keys()) | set(credits.keys()) | set(debits.keys())
        return frozendict(
            [
                (
                    Commodity.objects.get(pk=pk),
                    credits.get(pk, 0) + ipos.get(pk, 0) - debits.get(pk, 0),
                )
                for pk in keys
            ]
        )
@receiver(post_save, sender=User)
 def _user_post_save(sender, instance, created, **kwargs):
    # Create invites for the user, if they are permitted invites
    if created and settings.TRADING_FREE_INVITES:
        for _ in range(settings.TRADING_FREE_INVITES):
            Invite.objects.create(inviter=instance).save()
 class Invite(models.Model):
    """
    An invitation that is given out to a user.
    """
    id = HashidAutoField(primary_key=True)
    inviter = models.ForeignKey(User, on_delete=models.SET_NULL, null=True)
    accepted_user = models.ForeignKey(
        User,
        on_delete=models.CASCADE,
        null=True,
        default=None,
        related_name="+",
        verbose_name=_("accepted user"),
    )
    class Meta:
        verbose_name = _("invite")
        verbose_name_plural = _("invites")
 class Commodity(models.Model):
    """
    A commodity with some kind of market cap.
    A commodity has an associated "owner" account, which determines where the IPO for commodity
    goes.
    """
    id = HashidAutoField(primary_key=True)
    name = models.CharField(
        blank=False, unique=True, max_length=100, verbose_name=_("commodity name")
    )
    in_circulation = models.PositiveIntegerField()
    created_by = models.ForeignKey(User, null=True, on_delete=models.SET_NULL)
    symbol = models.CharField(
        blank=True, unique=True, max_length=6, verbose_name=_("symbol")
    )
    class Meta:
        verbose_name = _("commodity")
        verbose_name_plural = _("commodities")
    def get_absolute_url(self):
        return "/c/detail/%s" % self.pk
    def html_symbol(self) -> str:
        if self.symbol:
            return f"<span>{self.symbol}</span>"
        else:
            return f"<span>units of {self.name}"
 class MaxCommodityError(Exception):
    def __init__(self, user: User):
        self.user = user
        super().__init__("maximum commodity count reached")
 class Tx(models.Model):
    """
    A transaction from one account to another.
    """
    id = HashidAutoField(primary_key=True)
    instant = models.DateTimeField(auto_now_add=True, editable=False)
    source = models.ForeignKey(
        User,
        on_delete=models.PROTECT,
        related_name="debits",
        related_query_name="debit_tx",
        verbose_name=_("source"),
        editable=False,
    )
    dest = models.ForeignKey(
        User,
        on_delete=models.PROTECT,
        related_name="credits",
        related_query_name="credit_tx",
        verbose_name=_("destination"),
        editable=False,
    )
    amount = models.PositiveIntegerField(verbose_name=_("amount"), editable=False)
    commodity = models.ForeignKey(Commodity, on_delete=models.PROTECT, editable=False)
    class Meta:
        verbose_name = _("transaction")
        verbose_name_plural = _("transactions")
 class TxRequests(models.Model):
    """
    A transaction request between two users.
    """
    WAITING = "WAIT"
    DECLINED = "DECL"
    REVISED = "REV"
    STATUS_CHOICES = [
        (WAITING, "Waiting"),
        (DECLINED, "Declined"),
        (REVISED, "Revised"),
    ]
    status = models.CharField(
        max_length=max([len(c) for c in STATUS_CHOICES]),
        choices=STATUS_CHOICES,
        default=WAITING,
    )
    previous_request = models.OneToOneField(
        "TxRequests",
        null=True,
        default=None,
        on_delete=models.SET_NULL,
        related_name="revised_request",
    )
    source = models.ForeignKey(
        User,
        on_delete=models.CASCADE,
        null=True,
        related_name="transaction_requests_sent",
    )
    dest = models.ForeignKey(
        User,
        on_delete=models.CASCADE,
        null=True,
        related_name="transaction_requests_received",
    )
    source_sends = models.ForeignKey(
        Commodity, on_delete=models.CASCADE, related_name="+", null=True,
    )
    dest_sends = models.ForeignKey(
        Commodity, on_delete=models.CASCADE, related_name="+", null=True,
    )
    source_amount = models.PositiveIntegerField()
    dest_amount = models.PositiveIntegerField()
 class BalanceError(Exception):
    def __init__(
        self, balance: int, source: User, dest: User, amount: int, commodity: Commodity
    ) -> None:
        self.balance = balance
        self.source = source
        self.dest = dest
        self.amount = amount
        self.commodity = commodity
        super().__init__("balance too low to create transaction")
@receiver(pre_save, sender=Tx)
 def _tx_pre_save(sender, instance, *args, **kwargs):
    """
    Ensures that a transaction cannot be created if the source user doesn't have enough of the given
    commodity in their account.
    """
    if instance.pk is None:
        balance = instance.source.balance_of(instance.commodity)
        if instance.amount > balance:
            raise BalanceError(
                balance,
                instance.source,
                instance.dest,
                instance.amount,
                instance.commodity,
            )
--- a/trading/templates/trading/account/login.html
+++ b/trading/templates/trading/account/login.html
@@ -0,0 +1,25 @@
 {% extends "trading/base.html" %}
 {% load bootstrap4 %}
 {% block title %}
    {% with title="Login" %}
        {{ block.super }}
    {% endwith %}
 {% endblock title %}
 {% block content %}
    <div class="row">
        <div class="col-sm">
            <h4>Log in</h4>
            <form method="post">
                {% csrf_token %}
                {% bootstrap_messages %}
                {% bootstrap_form form %}
                {% buttons submit="Log in" %}{% endbuttons %}
                {% if next %}
                    <input type="hidden" name="next" value="{{next}}"/>
                {% endif %}
            </form>
        </div>
    </div>
 {% endblock %}
--- a/trading/templates/trading/account/password_change.html
+++ b/trading/templates/trading/account/password_change.html
@@ -0,0 +1,27 @@
 {% extends "trading/base.html" %}
 {% load bootstrap4 %}
 {% block title %}
    {% with title="Password change" %}
        {{ block.super }}
    {% endwith %}
 {% endblock title %}
 {% block content %}
    <div class="row">
        <div class="col-sm">
            <h4>Update your password</h4>
            <form method="post">
                {% csrf_token %}
                {% bootstrap_form form %}
                <div class="form-group">
                    <button class="btn btn-primary" type="submit">Change password</button>
                    <a class="btn btn-link" href="{% url "trading:index" %}" role="button">Cancel</a>
                </div>
                {% if next %}
                    <input type="hidden" name="next" value="{{next}}"/>
                {% endif %}
            </form>
        </div>
    </div>
 {% endblock %}
--- a/trading/templates/trading/account/password_change_done.html
+++ b/trading/templates/trading/account/password_change_done.html
@@ -0,0 +1,27 @@
 {% extends "trading/base.html" %}
 {% block title %}
    {% with title="Password change - success" %}
        {{ block.super }}
    {% endwith %}
 {% endblock title %}
 {% block content %}
    <div class="row">
        <div class="col-sm">
            <h2>Your password has been changed.</h2>
            <p>
            You will be redirected in 3 seconds.
            <a href="{{next|default:"/"}}" target="_blank">Click here if you are not automatically redirected.</a>
            </p>
        </div>
    </div>
    <script type="text/javascript">
        setTimeout(function() {
            document.location = "{{next|default:"/"}}";
        }, 3000);
    </script>
 {% endblock %}
--- a/trading/templates/trading/account/password_reset.html
+++ b/trading/templates/trading/account/password_reset.html
@@ -0,0 +1,24 @@
 {% extends "trading/base.html" %}
 {% load bootstrap4 %}
 {% block title %}
    {% with title="Password reset" %}
        {{ block.super }}
    {% endwith %}
 {% endblock title %}
 {% block content %}
    <div class="row">
        <div class="col-sm">
            <h4 class="text-center">Reset your password</h4>
            <form method="post">
                {% csrf_token %}
                {% bootstrap_form form %}
                {% buttons submit="Reset password" %}{% endbuttons %}
                {% if next %}
                    <input type="hidden" name="next" value="{{next}}"/>
                {% endif %}
            </form>
        </div>
    </div>
 {% endblock %}
--- a/trading/templates/trading/account/password_reset_complete.html
+++ b/trading/templates/trading/account/password_reset_complete.html
@@ -0,0 +1,17 @@
 {% extends "trading/base.html" %}
 {% block title %}
    {% with title="Password reset" %}
        {{ block.super }}
    {% endwith %}
 {% endblock title %}
 {% block content %}
    <div class="row">
        <div class="col-sm">
            <h4>Success</h4>
            Your password has successfully been reset. You may now use your new password to
            <a href="{% url 'trading:login'%}"> log in</a>.
        </div>
    </div>
 {% endblock %}
--- a/trading/templates/trading/account/password_reset_confirm.html
+++ b/trading/templates/trading/account/password_reset_confirm.html
@@ -0,0 +1,34 @@
 {% extends "trading/base.html" %}
 {% load bootstrap4 %}
 {% block title %}
    {% with title="Reset" %}
        {{ block.super }}
    {% endwith %}
 {% endblock title %}
 {% block content %}
    <div class="row">
        <div class="col-sm">
            {% if form %}
                <h4 class="text-center">Reset your password</h4>
                <form method="post">
                    {% csrf_token %}
                    {% bootstrap_form form %}
                    {% buttons submit="Reset password" %}{% endbuttons %}
                    {% if next %}
                        <input type="hidden" name="next" value="{{next}}"/>
                    {% endif %}
                </form>
            {% else %}
                <h4 class="text-center">Password reset error</h4>
                <p>
                The password reset link you are trying to use is either invalid
                or has expired. If you need to reset your password,
                <a href="{% url 'trading:password_reset' %}">click here</a> to
                do so.
                </p>
            {% endif %}
        </div>
    </div>
 {% endblock %}
--- a/trading/templates/trading/account/password_reset_done.html
+++ b/trading/templates/trading/account/password_reset_done.html
@@ -0,0 +1,20 @@
 {% extends "trading/base.html" %}
 {% block title %}
    {% with title="Password reset" %}
        {{ block.super }}
    {% endwith %}
 {% endblock title %}
 {% block content %}
    <div class="row">
        <div class="col-sm">
            <h4>Check your email</h4>
            <p>
            A password reset link has been sent to your email address. Please check your email
            and follow the instructions to finish resetting your password.
            </p>
        </div>
    </div>
 {% endblock %}
--- a/trading/templates/trading/account/settings.html
+++ b/trading/templates/trading/account/settings.html
@@ -0,0 +1,75 @@
 {% extends "trading/base.html" %}
 {% load bootstrap4 %}
 {% block title %}
    {% with title="Settings" %}
        {{ block.super }}
    {% endwith %}
 {% endblock title %}
 {% block content %}
    <div class="row">
        <div class="col-sm">
            <h2>User settings</h2>
            <strong> (<a href="{% url "trading:user_profile" object.id %}">view profile</a>)
        </div>
    </div>
    <div class="row">
        <div class="col-sm">
            <form method="post">
                {% csrf_token %}
                {% bootstrap_form form %}
                <div class="form-group">
                    <button class="btn btn-primary" type="submit">Update</button>
                </div>
                {% if next %}
                    <input type="hidden" name="next" value="{{next}}"/>
                {% endif %}
            </form>
            <p>
            <a href="{% url "trading:password_change" %}">Change your password here</a>
            </p>
        </div>
        <div class="col-sm">
            <h4>Invites</h4>
            {% if object.unused_invites %}
                <table class="table">
                    <thead>
                        <tr>
                            <th>Invite #</th>
                            <th>Link</th>
                        </tr>
                    </thead>
                    <tbody>
                        {% for invite in object.invite_set.all %}
                            {% if not invite.accepted_user %}
                                <tr>
                                    <td>{{ forloop.counter }}</td>
                                    <td>TODO Copy link script</td>
                                </tr>
                            {% endif %}
                        {% endfor %}
                    </tbody>
                </table>
            {% else %}
                No invites available.
            {% endif %}
        </div>
    </div>
 {% endblock %}
 {% comment %}
    <script>
        const copyToClipboard = str => {
            const el = document.createElement('textarea');
            el.value = str;
            el.setAttribute('readonly', '');
            el.style.position = 'absolute';
            el.style.left = '-9999px';
            document.body.appendChild(el);
            el.select();
            document.execCommand('copy');
            document.body.removeChild(el);
        };
    </script>
 {% endcomment %}
--- a/trading/templates/trading/base.html
+++ b/trading/templates/trading/base.html
@@ -0,0 +1,34 @@
 {% load staticfiles %}
 {% load bootstrap4 %}
 {# TODO l8n #}
 <html lang="en">
    <head>
        <meta charset="utf-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
        <link rel="stylesheet" href="{% static 'trading/css/bootstrap.min.css' %}" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T">
        <title>{% block title %}Trading{% if title %} - {{ title }}{% endif %}{% endblock title %}</title>
    </head>
    <body>
        {% block navbar %}
            {% include "trading/navbar.html" %}
        {% endblock navbar %}
        <main>
            <div class="container mt-5"> <!--  -->
                {% block messages %}
                    {% bootstrap_messages %}
                {% endblock %}
                {% block content %}{% endblock %}
            </div>
        </main>
        <script src="{% static 'trading/js/jquery-3.3.1.slim.min.js' %}" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo"></script>
        <script src="{% static 'trading/js/popper.min.js' %}" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1"></script>
        <script src="{% static 'trading/js/bootstrap.min.js' %}" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM"></script>
        {% block scripts %}{% endblock %}
    </body>
 </html>
--- a/trading/templates/trading/c/balances.html
+++ b/trading/templates/trading/c/balances.html
@@ -0,0 +1,18 @@
 {% load humanize %}
 <table class="table">
    <thead>
        <tr>
            <th>Commodity</th>
            <th>Amount</th>
        </tr>
    </thead>
    <tbody>
        {% for commodity, balance in object.balances.items %}
            <tr>
                <td>{{commodity.name}}</td>
                <td>{{balance|intcomma}}</td>
            </tr>
        {% endfor %}
    </tbody>
 </table>
--- a/trading/templates/trading/c/create.html
+++ b/trading/templates/trading/c/create.html
@@ -0,0 +1,40 @@
 {% extends "trading/base.html" %}
 {% load bootstrap4 %}
 {% block title %}
    {% with title="Create commodity" %}
        {{ block.super }}
    {% endwith %}
 {% endblock title %}
 {% block content %}
    <div class="row">
        <div class="col-sm">
            <h4>Create commodity</h4>
            {% if object.can_create_commodity %}
            <form method="post">
                {% csrf_token %}
                {% bootstrap_form form %}
                <div class="form-group">
                    <div class="alert alert-light">
                        <strong>Note:</strong> You have <strong>{{ object.unused_commodities|default:"unlimited" }}</strong>
                        {% if object.unused_commodities %}
                            commodit{{ object.unused_commodities|pluralize:"y,ies"}}
                        {% else %}
                            commodities
                        {% endif %} available to create.
                    </div>
                    <button class="btn btn-primary" type="submit">Create</button>
                    <a class="btn btn-link" href="{% url "trading:index" %}" role="button">Cancel</a>
                </div>
                {% if next %}
                    <input type="hidden" name="next" value="{{next}}"/>
                {% endif %}
            </form>
            {% else %}
                <p>You have created the maximum number of commodities you are allowed to create.</p>
                <p><a href="{% url "trading:settings" %}">Click here to view your settings.</a></p>
            {% endif %}
        </div>
    </div>
 {% endblock %}
--- a/trading/templates/trading/c/detail.html
+++ b/trading/templates/trading/c/detail.html
@@ -0,0 +1,16 @@
 {% extends "trading/base.html" %}
 {% load bootstrap4 %}
 {% block title %}
    {% with title="Commodity detail" %}
        {{ block.super }}
    {% endwith %}
 {% endblock title %}
 {% block content %}
    <div class="row">
        <div class="col-sm">
            <h4>{{object.name}}</h4>
        </div>
    </div>
 {% endblock %}
--- a/trading/templates/trading/index.html
+++ b/trading/templates/trading/index.html
@@ -0,0 +1,15 @@
 {% extends "trading/base.html" %}
 {% block content %}
    <div class="row">
        <div class="col-sm">
            <h4>Balances</h4>
            <p>{% include "trading/c/balances.html" with object=request.user %}</p>
            {% if request.user.can_create_commodity %}
                <p><a href="{% url "trading:commodity_create" %}">Create a new commodity</a></p>
            {% endif %}
        </div>
        <div class="col-sm">
        </div>
    </div>
 {% endblock %}
--- a/trading/templates/trading/navbar.html
+++ b/trading/templates/trading/navbar.html
@@ -0,0 +1,3 @@
 {% load staticfiles %}
 <nav class="navbar navbar-expand-lg">
 </nav>
--- a/trading/templates/trading/u/profile.html
+++ b/trading/templates/trading/u/profile.html
@@ -0,0 +1,51 @@
 {% extends "trading/base.html" %}
 {% load bootstrap4 %}
 {% load humanize %}
 {% block title %}
    {% with title="Profile" %}
        {{ block.super }}
    {% endwith %}
 {% endblock title %}
 {% block content %}
    <div class="row">
        <div class="col-sm">
            <h2>{{ object.username }}</h2>
        </div>
    </div>
    <div class="row">
        <div class="col-sm">
            <table class="table">
                <tr>
                    <td>Status</td>
                    <td>{{ object_status }}</td>
                </tr>
                <tr>
                    <td>Date joined</td>
                    <td>{{ object.date_joined.date }}</td>
                </tr>
            </table>
        </div>
        <div class="col-sm">
            <h4>Commodities owned by this user</h4>
            <table class="table">
                <thead>
                    <tr>
                        <th>Commodity</th>
                        <th>Circulation</th>
                    </tr>
                </thead>
                <tbody>
                    {% for commodity in object.commodity_set.all %}
                        <tr>
                            <td><a href="{% url "trading:commodity_detail" commodity.pk %}">{{ commodity.name }}</a></td>
                            <td>{{ commodity.in_circulation|intcomma }}</td>
                        </tr>
                    {% endfor %}
                </tbody>
            </table>
        </div>
    </div>
 {% endblock %}
--- a/trading/tests.py
+++ b/trading/tests.py
@@ -0,0 +1,3 @@
 from django.test import TestCase
 # Create your tests here.
--- a/trading/urls.py
+++ b/trading/urls.py
@@ -0,0 +1,77 @@
 from django.urls import path, include
 from django.views.generic.base import RedirectView
 from django.contrib.auth.views import *
 from django.urls import reverse_lazy
 from trading.views import *
 app_name = "trading"
 urlpatterns = [
    path("", IndexView.as_view(), name="index"),
    path("login/", RedirectView.as_view(url=reverse_lazy("trading:login"))),
    path("logout/", RedirectView.as_view(url=reverse_lazy("trading:logout"))),
    path(
        "accounts/login/",
        LoginView.as_view(template_name="trading/account/login.html",),
        name="login",
    ),
    path("accounts/logout/", LogoutView.as_view(), name="logout"),
    path(
        "accounts/password_reset/",
        PasswordResetView.as_view(
            template_name="trading/account/password_reset.html",
            success_url=reverse_lazy("trading:password_reset_done"),
        ),
        name="password_reset",
    ),
    path(
        "accounts/password_reset_done/",
        PasswordResetDoneView.as_view(
            template_name="trading/account/password_reset_done.html"
        ),
        name="password_reset_done",
    ),
    path(
        "accounts/password_reset_confirm/",
        PasswordResetConfirmView.as_view(
            template_name="trading/account/password_reset_confirm.html",
            success_url=reverse_lazy("trading:password_reset_complete"),
        ),
        name="password_reset_confirm",
    ),
    path(
        "accounts/password_reset_complete/",
        PasswordResetCompleteView.as_view(
            template_name="trading/account/password_reset_complete.html"
        ),
        name="password_reset_complete",
    ),
    path(
        "accounts/password_change/",
        PasswordChangeView.as_view(
            template_name="trading/account/password_change.html",
            success_url=reverse_lazy("trading:password_change_done"),
        ),
        name="password_change",
    ),
    path(
        "accounts/password_change_done/",
        PasswordChangeDoneView.as_view(
            template_name="trading/account/password_change_done.html"
        ),
        name="password_change_done",
    ),
    path("accounts/settings/", UserSettingsView.as_view(), name="settings"),
    # u/ for users
    path("u/profile/<int:pk>/", UserProfileView.as_view(), name="user_profile"),
    # t/ for tx
    # c/ for commodities
    path("c/create/", CommodityCreateView.as_view(), name="commodity_create"),
    #path("c/list/", CommodityListView.as_view(), name="commodity_list"),
    path("c/detail/<str:pk>/", CommodityDetailView.as_view(), name="commodity_detail"),
 ]
--- a/trading/views.py
+++ b/trading/views.py
@@ -0,0 +1,80 @@
 from django import forms
 from django.contrib.auth import views as auth_views, password_validation
 from django.contrib.auth.forms import UsernameField
 from django.contrib.auth.mixins import LoginRequiredMixin
 from django.contrib import messages
 from django.core.exceptions import PermissionDenied
 from django.http import HttpResponseForbidden, HttpResponseRedirect
 from django.views.generic import TemplateView
 from django.views.generic.detail import DetailView
 from django.views.generic.edit import CreateView, UpdateView
 from django.urls import reverse, reverse_lazy
 from django.utils.translation import gettext_lazy as _
 from trading.models import User, Commodity, MaxCommodityError
 class IndexView(LoginRequiredMixin, TemplateView):
    template_name = "trading/index.html"
 class CommodityDetailView(DetailView):
    template_name = "trading/c/detail.html"
    model = Commodity
 class CommodityCreateView(LoginRequiredMixin, CreateView):
    template_name = "trading/c/create.html"
    model = Commodity
    fields = (
        "name",
        "in_circulation",
    )
    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context["object"] = self.request.user
        return context
    def form_valid(self, form):
        user = self.request.user
        if not user.can_create_commodity():
            raise MaxCommodityError(user)
        form.instance.created_by = user
        return super(CreateView, self).form_valid(form)
 class UserProfileView(DetailView):
    template_name = "trading/u/profile.html"
    model = User
    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        if self.object.is_active:
            status = "Active"
        else:
            status = "Inactive"
        context["object_status"] = status
        return context
 class UserUpdateSettingsForm(forms.ModelForm):
    class Meta:
        model = User
        fields = (
            "username",
            "email",
        )
        field_classes = {"username": UsernameField}
    def __init__(self, user, *args, **kwargs):
        super().__init__(*args, **kwargs)
 class UserSettingsView(LoginRequiredMixin, UpdateView):
    template_name = "trading/account/settings.html"
    model = User
    fields = ("username", "email")
    success_url = reverse_lazy("trading:settings")
    def get_object(self, queryset=None):
        return self.request.user
		`@@ -0,0 +1,2 @@`
							`#!/bin/bash`
							`exec python3 ./manage.py "$@" --settings=market.settings.local`
		`@@ -0,0 +1,3 @@`
							`from django.contrib import admin`

							`# Register your models here.`
		`@@ -0,0 +1,3 @@`
							`from django.test import TestCase`

							`# Create your tests here.`